Question

Describe three devices by which cross pollination is encouraged in angiosperms by avoiding self pollination.​

Answer 1

Answer:Three outbreeding devices that flowering plants have developed:

Receptivity of stigma and release of the pollen grain is not synchronized, i.e., stigma becomes receptive much before pollens are released or after they are released to avoid self-pollination.

Self-incompatibility: A genetic method to prevent pollens from fertilizing ovules of the same flower by inhibiting their germination on stigma or pistil.

Production of unisexual flowers: So that the male and female parts will be present on different plants i.e., dioecious or on different flowers in the same plant (monoecious). This prevents both autogamy and geitonogamy.

Answer 2

The three devices by which cross pollination is encouraged in angiosperms by avoiding self pollination.​

Explanation:

Three outbreeding devices that flowering plants have developed:

• Receptivity of stigma and relief of the pollen grain is not synchronized, i.e., stigma enhances receptive much before pollens are delivered or after they are delivered to evade self-pollination.
• Self-incompatibility: A genetic approach to block pollen from fertilizing ovules of the same cluster by hindering their production on stigma or pistil.
• Generation of unisexual flowers: So that the male and female components will be present on several plants i.e., dioecious or on various shoots in the same flower. This limits both geitonogamy and autogamy.

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